CVE-2024-44968: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: tick/broadcast: Move per CPU pointer access into the atomic section The recent fix for making the take over of the broadcast timer more reliable retrieves a per CPU pointer in preemptible context. This went unnoticed as compilers hoist the access into the non-preemptible region where the pointer is actually used. But of course it's valid that the compiler keeps it at the place where the code puts it which rightfully triggers: BUG: using smp_processor_id() in preemptible [00000000] code: caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0 Move it to the actual usage site which is in a non-preemptible region.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.1.103 — 6.1.105
linux	linux_kernel	6.6.44 — 6.6.46
linux	linux_kernel	6.10.3 — 6.10.5
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/541a900d245536d4809cb1aa322c3fcc2cdb58a6 https://git.kernel.org/stable/c/668c6c4a7e9e9f081c06b70f30104fb7013437ed https://git.kernel.org/stable/c/6881e75237a84093d0986f56223db3724619f26e https://git.kernel.org/stable/c/7b3ec186ba93e333e9efe7254e7e31c1828e5d2d https://git.kernel.org/stable/c/7dd12f85f150010ef7518201c63fa7e395f5c3e9 https://git.kernel.org/stable/c/b9d604933d5fd72dd37f24e1dc35f778297d745a https://git.kernel.org/stable/c/f54abf332a2bc0413cfa8bd6a8511f7aa99faea0 https://git.kernel.org/stable/c/f91fb47ecacc178a83a77eeebd25cbaec18c01d6

Other References

https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-44968? +

In the Linux kernel, the following vulnerability has been resolved: tick/broadcast: Move per CPU pointer access into the atomic section The recent fix for making the take over of the broadcast timer more reliable retrieves a per CPU pointer in preemptible context. This went unnoticed as compilers hoist the access into the non-preemptible region where the pointer is actually used. But of course it's valid that the compiler keeps it at the place where the code puts it which rightfully triggers: BUG: using smp_processor_id() in preemptible [00000000] code: caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0 Move it to the actual usage site which is in a non-preemptible region. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-44968? +

CVE-2024-44968 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-44968? +

CVE-2024-44968 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-44968? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-44968